Service Manual

32
B. Control Board Check
Before replacing CB that does not show a visible defect and that you suspect is bad,
always conduct the following check procedure. This procedure will help you verify your
diagnosis. Always choose a neutral (W wire) to establish a good neutral connection when
checking voltages.
AlarmReset:IfCBisinalarm(beeping),pressthe"ALARMRESET"buttononCBwhile
CB is beeping. WARNING!Risk of electric shock. Care should be taken
not to touch live terminals. Once reset, the unit starts at the 1-minute ll
cycle.Foraudiblealarminformation,see"II.C.2.LEDLightsandAudible
AlarmSafeties."
1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10, and S5 dip
switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are
cleaning adjustments and the settings are exible. For factory default settings, see
"II.C.3.a)DefaultDipSwitchSettings."
2)Movethecontrolswitchtothe"ICE"position.IfCBred"POWEROK"LEDison,
controlvoltageisgood,continuetostep3.IfCBred"POWEROK"LEDisoff,check
CT secondary circuit. CT output is 10.5VAC at 115VAC primary input. If CT secondary
circuithaspropervoltageandCBred"POWEROK"LEDisoff,replaceCB.IfCT
secondary circuit does not have proper voltage, check CT primary circuit. Check for
1115VAC at CB K1 connector pin #10 (BRwire) to a neutral (W wire). For additional
checks,see"IV.F.1.NoIceProduction."
3)The"OUTPUTTEST"buttonprovidesarelaysequencetest.Makesurethecontrol
switchisinthe"ICE"position,thenpressthe"OUTPUTTEST"button.Thecorrect
lighting sequence is 1, 4, 3, 2. Note that the order of the LEDs from the outer edge of
CB is 1, 4, 3, 2. Components (e.g., Comp) will cycle during the test. Following the test,
the icemaker resumes operation. If the LEDs do not turn as described above, replace
CB.
4) To verify voltage output from CB to the components, slide CB K1 connectors out far
enough to allow multimeter lead contact. With the unit in the cycle to be tested, check
output voltage from the corresponding pin on CB K1 connector to a neutral (W wire). If
output voltage is not found and the appropriate LED is on, replace CB.
Legend: CB–control board; Comp–compressor; CT–control transformer